5 。3 。2 。6
Explaination :
A Picture ... Smile
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Clues :
A B C = 1
D E F G = 2
N O P Q R = 3 (reverse order)
R S T U V W = 4 (reverse order)
S.M.I.L.E
M N O P Q R S = 5
I J K L M = 3
I J K L = 2
E F G H I J K L = 6